Self-recording thermometer.



T. H. WURMB z-R. BAUMANN.

SELF RECORDING THERMOMETER.

Patented vAug'. 5, 1913.

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T. H, WURMB & R.. BAUMANN. SELF RECORDING THERMOMETER. APPLICATION FILED AUG. 29, 1910.

' 1,069,594.l I Patented Aug.5,1913.1

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T. H. WURMB &.R. BAUMANN. SELF RECORDING THERMOMETER. APPLIoATloN FILED AUG. 29, 1910.

Patented Aug. 5,1913.

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SELF BEGOBDING THERMOMETER. AYRLIIOATIOI FILED AUG 29,' 1910.

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'UNITED srnpnsmpnirunr OFFICE.

LIHtlODGRE H. WURMB AND ROBERT BAUMANN, 0F ST. LOUIS, MISSOURI, ASSIGNORS TO NATIONAL CLOCK & ELECTRIC MANUFACTURING C0., lOZF ST. LOUIS, MISSOURI,

A CORPORATION 0F MISSOURI.

SELF-RECORDING THERMOMETER.

Specification lof Letters Betreut.

To all whom t may concern.'

Be it known that we, THEODORE H. WUBMB and ROBERT BAUMANN, citizens of the United States, and residentsof St. Louis, Missouri, have invented certain new and useful Improvements in Self-Recordin Thermometers, of which the following is a specification containing 'a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

Our invention relates to improvements in 'self-recording thermometers and particularly relates to that class of devices employing a revoluble dial timed to move at a uniform speed of travel, a marking device and thermally operated means connected with the marker for moving the same corresponding to the variations in temperature.

The primary object of our invention is to construct a shifting gear-mechanism whereby ,the recorder may .be easily and quickly .adapted to change the speed of rotation .of the dial-support whereby the dial may be moved at 4different speeds' as required to record either daily or weekly reco-rds.

For the above ypurposes our invention consists in certain.. novel features of construction and arrangement of parts as will be hereinafter more fully described, pointed out in the claims and illustrated by the accompanying drawings, in which- Figure 1 is a front elevation of the complete device parts of the casing, dial 'a'nd dial-support being bro-ken away; Fig. 2 is a vertical, sectional elevation taken approximately o-n the line 2--2 of Fig. 1; F 3 is a sectional elevation taken on the line 3 3 of Fig. A2; and illustrates the rear face of the shifting gear; Fig. 4 is a front elevation of the shifting gear, portions being broken away to illustrate otherwise obscured parts;

Fig. 5 is a sectional plan taken on the line 5 5 of Fig. 1; Fig. 6 is an enlarged, vertical, sectional detail taken on the line 6 6 of Fig. 1; and Fig. 7 is an enlarged, sectional detail illustrating the manner of mounting the dial and gear wheel for operating the dial.

Referring by numerals to the accompanying drawings: 1 designates the casing.

2 designates the time movement which is preferably of the type known as a marine movement or a double-spring, eight daylever movement.

The numeral 3 designates the minute hand shaft upon which is mounted to turn free thereon a gear wheel l, the forward 'end of the hub 5 of which is threaded to receive and hold in place the fianged collar 6, the forward end 7 of which is reduced and eX- ternally threaded to receive the knurled knob 8.

9 designates a record sheet which is cen.- trally apertured and mounted upon the flanged collar 6 and held in place between said flanged collar and the knurled knob 8.

A portion of a record sheet is shown in Fig. l. The sheet shown is of the ordinary daily record type. Other sheets, (not shown) are employed to keep a weekly record ofthe variations in temperature.

l0 designates a plate or backing for the record sheet. A

In the lowermost portion of the casing 1 there is pivotally mounted a marking device 12 the upper free end of which is provided with means (not shown) for engagement with the record sheet, which means may be either a pen having a'constant source of ink supply, an ordinary graphite pencil or, in some instances, an electric contact-l 16 and 17 designate frame plates which are substantially of the same out-line and are held and spaced apart by the bolts'18 and sleeves 19. Projecting rearwardly from the rearmost plate 17 are a pair of posts 20 the outer ends of which supporta plate 21, the plate being providedwith an integral, tubu lar journal 22 which is mounted for movement in the bearing 15 of the bracket 14.

Mounted for rotation independently of the movement of the gear frame is a shaft 23 upon which there is mounted for rotation with the shaft a gear wheel 24, which gear wheel is in mesh with the first or largest drive wheel 'on the right hand side of the time movement.

Mounted on the shaft 23, between the plates of the gear frame, is a gear wheel 25 Patented A110. 5,1913.

which meshes with a larger gear wheel 2G supported between the plates otl the gear frame, which gear wheel is mounted upon a shaft 2T upon which shaft there is also mounted for rotation with the wheel 26 a smaller gear wheel 28 which meshes with a gear wheel 29 of substantially the same size as the wheel 26 and which wheel is arranged between the plates of thegear frame on the shaft 30.

The gear wheel 29 'meshes with a gear wheel 3l which is mounted between the plates of the frame and has a relatively broad face, the gear wheels 26 and 31 being arranged for alternate engagement with the gear wheel 4 for the rotation of the record sheet. Then the gear wheel 26 meshes with the wheel 4 the record sheet is turned one revolution in twenty four hours. IVhen the gear'wheel 3l meshes with the gear wheel 4 the record' sheet is moved one revolution in one weeks time, hence the ratio between the geall wheels 2G and 3l is sevento one. Carried by the plates there is a pin which is operated in one direction by a spring 33 provided with a knurled knob 34 for manual operation against the tension of the spring.

Formed integral with the casing there is a bres 35 having in its forward face depressions 34,3 and 3T arranged to coact with said pm 32 to hold the gear frame 1n different set positions.

" devices, the marking device being operated by the thermo spring. Now, it it be desired to keep a weekly record of the variations in temperature, the knurled knob 8 is removed, the daily record sheet is removed, and a weekly record sheet is arranged in place and held by the knob 8. It is only necessary now to remove the pin 32 from the depression 37 and rock the gear frame until the wheel 31 meshes with the wheel .4 and seating the pin 32 in the depression 36 to hold the frame so that the wheel 31 is held in mesh with the wheel 4, thereby reducing the speed of travel of the record as compared with the speed of travel for a daily record at a ratio of one to seven or a difference between twenty four hours and one weeks time.

l/Ve claim:

1. In a self-recording thermometer, a time movement, a revoluble support arranged to receive interchangeable record sheets, a gear device operated by said time movement, a gear device secured to said revoluble support, a rocking frame,a tram of gear devices carried by said rocking' frame, and means whereby the rocking frame may be held in diierent set positions, as required to change the ratio of speed between the time movement and the revoluble support.

2. In a self-recording thermometer, a time movement, a revoluble support arranged to receive interchangeable record sheets, a gear device operated by said time 'movement, a gear device secured to said revoluble support, a rocking frame, a train of gear devices carried by said rocking frame, an arm carried by said rocking frame, a spring-actuated locking device carried by said arm, and a iXed element. inthe path ot travel of said arm arranged to cooperate with said spring-actuated locking device for holding the rocking frame in ditferent set positions, substantially as shown and for the purposes stated.

In testimony whereof, we have signed our names to this specification, in presence of two subscribing witnesses.

THEODORE H. VURMB. ROBERT BAUMANN. IVitnesses E. L. WALLACE, N. Gr. BUTLER 

